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  1. A man walked a certain distance. One-third he walked at 5 km per hr. Another one-third he walked at 10 km per hr. and the rest at 15 km per hr. Find his average speed.
    1. 8
      1
      kmph
      11
    2. 7
      1
      kmph
      11
    3. 7
      2
      kmph
      11
    4. 8
      2
      kmph
      11
Correct Option: D

Here, the man covers equal distance at different speeds. Using the formula, the Average Speed is given by

=
3
1
+
1
+
1
51015

=
3
6 + 3 + 2
30

=
90
= 8
2
km per hour.
1111


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